Líffræðifélag Íslands - biologia.is
Líffræðiráðstefnan 2019

Erindi/veggspjald / Talk/poster V51

Effect of growth rate on otolith shape in Icelandic cod ecotypes

Höfundar / Authors: Einar Pétur Jónsson, Steven Campana, Jón Sólmundsson, Klara Jakobsdóttir

Starfsvettvangur / Affiliations: 1. Háskóli Íslands, 2. Hafrannsóknastofnun

Kynnir / Presenter: Einar Pétur Jónsson

The cod stock around Iceland has been defined as having two ecotypes with both phenotypic and genotypic variations linked with their different migratory patterns. Wavelet and Fast Fourier transform can both describe otolith shape and the latter has detected otolith outer shape variation between the ecotypes around Iceland. However, previous work has indicated that growth rate is strongly linked to otolith shape differences among stocks. Here we use both Fourier and Wavelet transforms on otoliths from an archived cod dataset as well as contemporary samples to test whether the otolith shape differences between the ecotypes in Icelandic waters are due to growth rate differences between the two, which would render this distinction between the ecotypes susceptible to growth rate alterations – a possible scenario in today‘s changing oceans.